A study testing vipoglanstat for women with moderate to severe endometriosis-related pain

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What is this study about?

This study involves women with endometriosis, a condition where tissue similar to the lining of the womb grows in other places in the body, often causing pain. The study focuses specifically on pain that occurs outside of menstrual periods, which is called non-menstrual pelvic pain. The treatment being tested is called vipoglanstat, also known by its code name GS-248, which comes in capsule form. Some participants will receive vipoglanstat while others will receive placebo. The purpose of this study is to evaluate how well vipoglanstat works in reducing pain related to endometriosis and to assess its safety.

The study will compare two different doses of vipoglanstat with placebo to see which works best. Participants will take the medication by mouth in capsule form. During the study, women will be asked to record their pain levels, particularly focusing on pain during days when they are not menstruating. The study will also look at pain during menstrual bleeding days, which is called dysmenorrhea. Information will be collected about any use of pain relief medications, including opioid medications, which are strong pain relievers. The study will also measure how endometriosis affects quality of life and daily activities using questionnaires.

The treatment period will last for four months, during which participants will attend several visits. Throughout the study, doctors will monitor participants for any side effects and will perform regular safety checks including blood tests and urine tests. The study will track changes in pain levels from the beginning of treatment to the end of the four-month period to determine if vipoglanstat is effective in reducing endometriosis-related pain.

1 Treatment period begins

After joining the study, you will be randomly assigned to one of three treatment groups. You will receive either vipoglanstat at one of two different doses, or a placebo (a capsule that looks identical but contains no active ingredient).

The study is double-blind, which means neither you nor your doctor will know which treatment you are receiving during the study.

You will take the assigned medication by mouth in the form of capsules.

2 Daily medication and pain tracking

You will take your assigned capsules daily as instructed throughout the treatment period.

You will be asked to track your pain levels daily using a pain rating scale. This includes recording your worst pain on days when you are not menstruating (non-menstrual pelvic pain) and during your menstrual bleeding days (dysmenorrhea).

You will record any use of additional pain medication, including opioid rescue medication, which refers to strong pain relievers you may take when needed.

This daily tracking will help measure how well the treatment is working.

3 Regular study visits

You will attend scheduled study visits throughout the treatment period.

During these visits, your health will be monitored through physical examinations and laboratory tests, including blood tests and urine tests.

You will complete questionnaires about your quality of life, including the EHP-30, which is a questionnaire specifically designed to assess how endometriosis affects your daily life and well-being.

One section of the questionnaire will focus on pain during sexual intercourse.

Any side effects or health changes you experience will be recorded and reviewed.

4 Fourth month assessment

At the end of the fourth month of treatment, your pain levels will be compared to your pain levels at the start of the study.

The main focus will be on whether your non-menstrual pelvic pain has decreased by at least 2 points on the pain scale, or by at least 30%, without needing to increase your use of opioid pain medication.

Your menstrual pain (dysmenorrhea) will also be assessed in the same way.

Changes in your quality of life scores and your use of rescue pain medication will be evaluated.

5 Safety monitoring throughout the study

Throughout the entire study period, your safety will be closely monitored.

Any adverse events, which are any unwanted or unexpected health problems that occur during the study, will be recorded and assessed.

Regular laboratory tests will check your blood cell counts, kidney and liver function, and other health markers.

All safety information will be reviewed to ensure the treatment is well-tolerated.

Who Can Join the Study?

You must be a premenopausal female, which means you still have regular menstrual periods and have not yet gone through menopause
You must be between 18 and 44 years old at the first visit
You must have a confirmed diagnosis of endometriosis, which is a condition where tissue similar to the lining of the uterus grows outside the uterus. This diagnosis must have been confirmed within the last 10 years or at the first visit through one of these methods: surgery where the doctor directly saw the tissue or took a sample for testing, or through imaging tests such as transvaginal ultrasound, which is an internal ultrasound examination, or MRI, which is a magnetic resonance imaging scan that creates detailed pictures of the inside of your body
You must have a history of non-menstrual pelvic pain, which is pain in the lower belly area that occurs at times other than during your period, and this pain must significantly affect your daily activities
You must report that you experienced moderate, severe, or very severe pain on days when you were not having your period during the month before the second visit

Who Cannot Join the Study?

You are a man. This study only includes women.
You are under 18 years old. This study is only for adults.
You do not have endometriosis-related pain. Endometriosis is a condition where tissue similar to the lining of the womb grows outside the womb, causing pain.
You are pregnant or planning to become pregnant during the study period.
You are breastfeeding.
You have a known allergy or bad reaction to the study medicine or any of its ingredients.
You have severe liver or kidney problems that could affect how your body processes the medicine.
You have other serious medical conditions that could make it unsafe for you to participate.
You are taking certain medicines that could interact badly with the study medicine.
You have participated in another clinical trial within the last few weeks or months.
You are unable or unwilling to follow the study requirements, such as attending visits or taking the medicine as directed.

Where you can join this trial?

Verified and Recommended Sites

No sites found in this category

Verified Sites

Site Name	City	Country
Azienda Ospedaliero Universitaria Careggi	Florence	Italy
Fondazione Policlinico Universitario Agostino Gemelli IRCCS	Rome	Italy
Stella-Gyn s.r.o.	Vodnany	Czechia
Gyncare MUDr. Michael Svec s.r.o.	Plzen 2-Slovany	Czechia
Niepubliczny Zaklad Opieki Zdrowotnej Medem Wilk Sp. j.	Katowice	Poland

Other Sites

Site Name	City	Country
Semmelweis University	Budapest	Hungary
Mbal Lyulin EAD	Sofia	Bulgaria
TritonLife Magankorhazak Zrt.	Budapest	Hungary
Genesys Fertility Center S.R.L.	Bucharest	Romania
In Vivo Sp. z o.o.	Bydgoszcz	Poland
Fakultni Nemocnice Bulovka	Prague	Czechia
Vita Longa Sp. z o.o.	Katowice	Poland
ARNAS Civico Di Cristina Benfratelli	Palermo	Italy
Mmwbfnuagmymt Boskizfl Zj Ayonlmw Lshaqcrd Pbqe Aa	Blagoevgrad	Bulgaria
Ubultjqotr Of Dbnjujtw	Debrecen	Hungary
Fnvmfjzo Ndellpcmc Berf	Brno	Czechia
Flpmqqoj Nudufeaxp Kcrxgtite Vbolxafbl	Prague	Czechia
Ikmsj Oieiytlk Pdrrzbnlgpk Sev Mziydcz	Genoa	Italy
Pfadnyp Snd z oeht	Katowice	Poland
Dlfew Hcbpfu Cdri Suzlpb	Bucharest	Romania
Sgtydm Vdvnyvppp Kjfflp Mpa Oilbjs Ksngts	Kaposvar	Hungary
Sgltzqto Cfpsfp Flvwcpnzeps	Bucharest	Romania
Qicssyd Mfxxzqh Cchhtq Snpsbh	Bucharest	Romania
Chmhthk Mhfbojje Jepbvub Sif z oacr	Warsaw	Poland
Mzztblg Cqreql Fakzcvfdfg Ejfv	Sofia	Bulgaria
Gzixeyuztbk Mvzj sgjzwe	Brno	Czechia
Copqcoz Gzfnztihiok Etggpsrpuoyjvg I Mdmminpy Rlnqluc Agqmxmbk Dhmivvy I Pfkvaaiuy Snb pl Lxlnvxh	Bialystok	Poland
Sxcstqfcnqainxk Pfalklir Lvvyfwba Kxpnbsmfh Djpjjmrs	Warsaw	Poland
Gtfjjhc Boeraty Mrpnqa Pundcdlo Lfwmelbb	Cracow	Poland
Amlliwa Sdn z ozed	Poznan	Poland
Sak Mkqymg Skwvvz	Caracal	Romania
Tjcfk Pnpshaiqhqh Sylxmfjhcnbb Ctatlhn Mgkemgwp Sor z oyfz	Szczecin	Poland
Lzlsfw 2 Ska z ofrv	Siedlce	Poland
Cthwelw Mfffvxx Udhxzh Skdzhb	Brasov	Romania
Nfwfob guobwnnayfmhq azktefpdf splqde	Olomouc	Czechia
Hqp Sfz z oywe	Lublin	Poland
Eqeelbzry Iynflbzdp Fit Cuebkknjtgwain Dzygfpln Asa Txrdruigxk	Targu Mures	Romania
Sbgedouxkonzxyu Pgnzhvdb Gqaoudeetrzpcx Jxyzdu Txkfdbxpvin snjdp	Bialystok	Poland
Mixrki Kwjy	Budapest	Hungary

Trial status

Country	Status	Recruitment Start
Bulgaria	Recruiting	14.10.2025
Czechia	Recruiting	14.10.2025
Hungary	Recruiting	14.10.2025
Italy	Not yet recruiting	14.10.2025
Poland	Recruiting	14.10.2025
Romania	Recruiting	14.10.2025

Trial locations

Investigated Drugs:

Vipoglanstat is an investigational medication being studied for the treatment of moderate to severe pain related to endometriosis. This medication is being tested to see if it can help reduce pain that women experience due to endometriosis, a condition where tissue similar to the lining of the uterus grows outside the uterus.

Placebo is an inactive substance that looks like the real medication but contains no active treatment. It is used in this study to compare the effects of vipoglanstat against no active treatment, helping researchers determine if the medication truly works.

Investigated Diseases:

Endometriosis

Endometriosis – Endometriosis is a condition where tissue similar to the lining of the uterus grows outside the uterus, commonly on the ovaries, fallopian tubes, and other pelvic organs. This misplaced tissue continues to act as it normally would during the menstrual cycle, thickening, breaking down, and bleeding with each period. However, because this tissue has no way to exit the body, it becomes trapped and can cause inflammation and the formation of scar tissue. The condition often causes pain, particularly during menstrual periods, but can also result in pain during other times of the month unrelated to menstruation. Pain during sexual intercourse and bowel movements are also common symptoms. Over time, endometriosis can lead to the development of adhesions that bind organs together and affect daily functioning and quality of life.

Trial ID:

2025-522452-16-00

Protocol code:

GS-248-203

Trial Phase:

Therapeutic exploratory (Phase II)

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A study testing vipoglanstat for women with moderate to severe endometriosis-related pain

What is this study about?

Who Can Join the Study?

Who Cannot Join the Study?